TDA7421 Datasheet, PDF (20/38 Pages) STMicroelectronics – AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS

TDA7421
Frame Example
For addressing the PLL part:
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
LSB
MSB
LSB
MSB
S 1 1 0 0 0 1 0 0 ACK T2 T1 T0 I A3 A2 A1 A0 ACK
D96AU549
for the TUNER part:
LSB
ACK P
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
LSB
MSB
LSB
MSB
S 1 1 0 0 0 1 1 0 ACK 0 0 0 I A3 A2 A1 A0 ACK
D96AU550
LSB
ACK P
ACK = Acknowledge
S = Start
P = Stop
I = Page mode
T2, T1, T0 = used in test mode (for PLL only, for
TUNER addressing they must be 0)
A3, A2, A1, A0 = Mode selection
TUNER SUBADDRESS
MSB
X
X
X
0
0
0
PLL SUBADDRESS
LSB
FUNCTION
I
A3
A2
A1
A0
0
0
0
0 STATUS
0
0
0
1 FM STOP STATION / FM IF AGC
0
0
1
0 FM SMETER SLIDER
0
0
1
1 AM AGC1 / AM STOP STATION
0
1
0
0 IFT1 / IFT2
0
1
0
1 FRONT END ADJUSTMENT
0
1
1
0 FM DEMODULATOR ADJUSTMENT
0
1
1
1 FM IF BUFFERS
1
0
0
0 FM AUDIO MUTE GAIN / FM SOFT MUTE
1
0
0
1 FM HOLE DETECTOR / FM DETUNING
0
Page mode disabled
1
Page mode enabled
must be "0"
MSB
LSB
FUNCTION
T3
T2
T1
I
A3
A2
A1
A0
0
0
0
0 Charge pump control
0
0
0
1 PLL counter 1 (LSB)
0
0
1
0 PLL counter 2 (MSB)
0
0
1
1 PLL reference counter 1 (LSB)
0
1
0
0 PLL reference counter 2 (MSB)
0
1
0
1 PLL lockdetector control and PLL mode select
0
1
1
0 IFC reference counter 1 (LSB)
0
1
1
1 IFC reference counter 2 (MSB) and IFC mode select
1
0
0
0 IF counter control 1
1
0
0
1 IF counter control 2
0
page mode DISABLED
1
page mode enabled
T1, T2, T3 are used for testing the PLL, in application mode they have to be "0".
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